//----------------------------------------------
//            NGUI: Next-Gen UI kit
// Copyright © 2011-2014 Tasharen Entertainment
//----------------------------------------------

using UnityEngine;

/// <summary>
/// Tween the camera's field of view.
/// </summary>

[RequireComponent(typeof(Camera))]
[AddComponentMenu("NGUI/Tween/Tween Field of View")]
public class TweenFOV : UITweener
{
    public float from = 45f;
    public float to = 45f;

    Camera mCam;

    public Camera cachedCamera { get { if (mCam == null) mCam = GetComponent<Camera>(); return mCam; } }

    [System.Obsolete("Use 'value' instead")]
    public float fov { get { return this.value; } set { this.value = value; } }

    /// <summary>
    /// Tween's current value.
    /// </summary>

    public float value { get { return cachedCamera.fieldOfView; } set { cachedCamera.fieldOfView = value; } }

    /// <summary>
    /// Tween the value.
    /// </summary>

    protected override void OnUpdate(float factor, bool isFinished) { value = from * (1f - factor) + to * factor; }

    /// <summary>
    /// Start the tweening operation.
    /// </summary>

    static public TweenFOV Begin(GameObject go, float duration, float to)
    {
        TweenFOV comp = UITweener.Begin<TweenFOV>(go, duration);
        comp.from = comp.value;
        comp.to = to;

        if (duration <= 0f)
        {
            comp.Sample(1f, true);
            comp.enabled = false;
        }
        return comp;
    }

    [ContextMenu("Set 'From' to current value")]
    public override void SetStartToCurrentValue() { from = value; }

    [ContextMenu("Set 'To' to current value")]
    public override void SetEndToCurrentValue() { to = value; }

    [ContextMenu("Assume value of 'From'")]
    void SetCurrentValueToStart() { value = from; }

    [ContextMenu("Assume value of 'To'")]
    void SetCurrentValueToEnd() { value = to; }
}
